Measurements of the dependence of the thermal conductivity λ (T, ϱ) of 4He vapor on the density ϱ are presented at 3.3 and 4.5 K. The initial dependence upon ϱ near ϱ = 0 agrees with the prediction of the modified Enskog theory; but at higher densities there are departures from the prediction. The excess thermal conductivity λ(T, ϱ) − λ(T, 0) is independent of T within experimental error.
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Ahlers, G. Thermal conductivity of 4He vapor as a function of density. J Low Temp Phys 31, 429–439 (1978). https://doi.org/10.1007/BF00115094
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DOI: https://doi.org/10.1007/BF00115094